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Confined Dissipative Droplet Solitons in Spin-Valve Nanowires with Perpendicular Magnetic Anisotropy
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF.
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2014 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 112, no 4, 047201- p.Article in journal (Refereed) Published
Abstract [en]

Magnetic dissipative droplets are localized, strongly nonlinear dynamical modes excited in nanocontact spin valves with perpendicular magnetic anisotropy. These modes find potential application in nanoscale structures for magnetic storage and computation, but dissipative droplet studies have so far been limited to extended thin films. Here, numerical and asymptotic analyses are used to demonstrate the existence and properties of novel solitons in confined structures. As a nanowire's width is decreased with a nanocontact of fixed size at its center, the observed modes undergo transitions from a fully localized two-dimensional droplet into a two-dimensional droplet edge mode and then a pulsating one-dimensional droplet. These solitons are interpreted as dissipative versions of classical, conservative solitons, allowing for an analytical description of the modes and the mechanisms of bifurcation. The presented results open up new possibilities for the study of low-dimensional solitons and droplet applications in nanostructures.

Place, publisher, year, edition, pages
2014. Vol. 112, no 4, 047201- p.
Keyword [en]
Domain-Wall Motion, Electric-Current, Polarized Current, Nano-Oscillators, Driven, Torque, Excitation, Waves, Multilayer, Logic
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-143726DOI: 10.1103/PhysRevLett.112.047201ISI: 000331947500017ScopusID: 2-s2.0-84894461827OAI: diva2:708553
Swedish Research CouncilSwedish Foundation for Strategic Research Knut and Alice Wallenberg Foundation

QC 20140328

Available from: 2014-03-28 Created: 2014-03-27 Last updated: 2014-03-28Bibliographically approved

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Mohseni, MajidChung, SunjaeÅkerman, Johan
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